JavaFX 2.2 TextField maxlength

Question

I am working with a JavaFX 2.2 project and I have a problem using the TextField control. I want to limit the characters that users will enter to each TextField but I can\'t

Answer 1

private void registerListener1(TextField tf1, TextField tf2,TextField tf3,TextField tf4) {
    tf1.textProperty().addListener((obs, oldText, newText) -> {

        if(newText.length() == 12) {

            tf1.setText(newText.substring(0, 3));
            tf2.setText(newText.substring(tf1.getText().length(), 6));              
            tf3.setText(newText.substring(tf1.getText().length()+tf2.getText().length(), 9));
            tf4.setText(newText.substring(tf1.getText().length()+tf2.getText().length()+tf3.getText().length()));
            tf4.requestFocus();
        }
    });

}

private void registerListener(TextField tf1, TextField tf2) {
    tf1.textProperty().addListener((obs, oldText, newText) -> {
        if(oldText.length() < 3 && newText.length() >= 3) {
            tf2.requestFocus();
        }
    });

}

Answer 2

The code below will re-position the cursor so the user doesn't accidentally overwrite their input.

public static void setTextLimit(TextField textField, int length) {
    textField.setOnKeyTyped(event -> {
        String string = textField.getText();

        if (string.length() > length) {
            textField.setText(string.substring(0, length));
            textField.positionCaret(string.length());
        }
    });
}

Answer 3

You can do something similar to approach described here: http://fxexperience.com/2012/02/restricting-input-on-a-textfield/

class LimitedTextField extends TextField {

    private final int limit;

    public LimitedTextField(int limit) {
        this.limit = limit;
    }

    @Override
    public void replaceText(int start, int end, String text) {
        super.replaceText(start, end, text);
        verify();
    }

    @Override
    public void replaceSelection(String text) {
        super.replaceSelection(text);
        verify();
    }

    private void verify() {
        if (getText().length() > limit) {
            setText(getText().substring(0, limit));
        }

    }
};